import Foundation
import Combine
import CoreBluetooth

// 连接服务协议
protocol CarConnectionProtocol {
    var connectionStatus: ConnectionStatus { get }
    var isConnected: Bool { get }
    var statusPublisher: Published<ConnectionStatus>.Publisher { get }
    
    func connect()
    func disconnect()
    func reconnect()
    func scanForDevices() -> [String]
}

// 汽车连接服务
class CarConnectionService: NSObject, ObservableObject, CarConnectionProtocol {
    // MARK: - 属性
    @Published var connectionStatus: ConnectionStatus = .disconnected
    var isConnected: Bool {
        return connectionStatus == .connected
    }
    
    var statusPublisher: Published<ConnectionStatus>.Publisher { $connectionStatus }
    
    // 蓝牙管理器
    private var centralManager: CBCentralManager?
    private var peripheralDevice: CBPeripheral?
    
    // 设备标识符
    private var deviceName: String = ""
    private var deviceUUID: UUID?
    
    // 设置
    private var settings: AppSettings
    private var connectionSettings: ConnectionSettings?
    
    // MARK: - 初始化方法
    init(settings: AppSettings, connectionSettings: ConnectionSettings? = nil) {
        self.settings = settings
        self.connectionSettings = connectionSettings
        super.init()
        
        // 设置设备名称
        self.deviceName = settings.deviceName
        
        // 初始化蓝牙中央管理器
        if settings.isBluetoothEnabled {
            self.centralManager = CBCentralManager(delegate: self, queue: nil)
        }
        
        // 自动连接
        if settings.isAutoConnectEnabled {
            DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
                self.connect()
            }
        }
    }
    
    // MARK: - 公共方法
    func connect() {
        // 模拟连接过程
        connectionStatus = .connecting
        
        // 显示连接信息（如果有）
        if let connectionSettings = connectionSettings {
            print("尝试连接到: \(connectionSettings.ipAddress):\(connectionSettings.port)")
        }
        
        // 模拟连接延迟
        DispatchQueue.main.asyncAfter(deadline: .now() + 2) { [weak self] in
            // 随机成功率为80%
            let success = Int.random(in: 1...10) <= 8
            
            if success {
                self?.connectionStatus = .connected
                print("已连接到设备: \(self?.deviceName ?? "")")
            } else {
                self?.connectionStatus = .error
                print("连接到设备失败: \(self?.deviceName ?? "")")
            }
        }
    }
    
    func disconnect() {
        // 如果当前已连接，则断开连接
        if connectionStatus == .connected {
            connectionStatus = .disconnected
            print("已断开与设备的连接: \(deviceName)")
        }
    }
    
    func reconnect() {
        disconnect()
        DispatchQueue.main.asyncAfter(deadline: .now() + 1) { [weak self] in
            self?.connect()
        }
    }
    
    func scanForDevices() -> [String] {
        // 模拟扫描到的设备列表
        return [
            "智能小车-01",
            "智能小车-02",
            "智能小车-03"
        ]
    }
    
    // 设置连接设置
    func updateConnectionSettings(_ newConnectionSettings: ConnectionSettings) {
        self.connectionSettings = newConnectionSettings
    }
}

// MARK: - 蓝牙中央管理器代理
extension CarConnectionService: CBCentralManagerDelegate {
    func centralManagerDidUpdateState(_ central: CBCentralManager) {
        switch central.state {
        case .poweredOn:
            print("蓝牙已开启")
        case .poweredOff:
            print("蓝牙已关闭")
            connectionStatus = .disconnected
        case .resetting:
            print("蓝牙重置中")
        case .unauthorized:
            print("蓝牙未授权")
        case .unsupported:
            print("设备不支持蓝牙")
        case .unknown:
            print("蓝牙状态未知")
        @unknown default:
            print("蓝牙未知状态")
        }
    }
}

// 模拟Wi-Fi连接
extension CarConnectionService {
    func connectViaWiFi(ssid: String, password: String) {
        // 模拟WiFi连接
        print("尝试通过WiFi连接: \(ssid)")
        
        connectionStatus = .connecting
        
        // 模拟连接延迟
        DispatchQueue.main.asyncAfter(deadline: .now() + 2) { [weak self] in
            // 随机成功率为80%
            let success = Int.random(in: 1...10) <= 8
            
            if success {
                self?.connectionStatus = .connected
                print("已通过WiFi连接到设备")
            } else {
                self?.connectionStatus = .error
                print("WiFi连接失败")
            }
        }
    }
    
    // 通过IP和端口连接
    func connectViaNetwork(ipAddress: String, port: Int) {
        print("尝试通过网络连接到: \(ipAddress):\(port)")
        
        connectionStatus = .connecting
        
        // 模拟连接延迟
        DispatchQueue.main.asyncAfter(deadline: .now() + 2) { [weak self] in
            // 随机成功率为80%
            let success = Int.random(in: 1...10) <= 8
            
            if success {
                self?.connectionStatus = .connected
                print("已通过网络连接到设备: \(ipAddress):\(port)")
            } else {
                self?.connectionStatus = .error
                print("网络连接失败: \(ipAddress):\(port)")
            }
        }
    }
} 